Sorbitol-based aqueous cyclic carbonate dispersion for waterborne nonisocyanate polyurethane coatings via an environment-friendly route / Zhijun Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 3 (05/2019) . - p. 721-732 Titre : Sorbitol-based aqueous cyclic carbonate dispersion for waterborne nonisocyanate polyurethane coatings via an environment-friendly route Type de document : texte imprimé Auteurs : Zhijun Wu, Auteur ; Jingtao Dai, Auteur ; Liuyan Tang, Auteur ; Jinqing Qu, Auteur Année de publication : 2019 Article en page(s) : p. 721-732 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anhydrides Caractérisation Carbonate cyclique Revêtements en phase aqueuse Revêtements sans isocyanates Rhéologie Sorbitol Index. décimale : 667.9 Revêtements et enduits Résumé : The cyclic carbonate derivatives carrying carboxyl groups were prepared via the reaction of the sorbitol-based cyclic carbonate (SC) with anhydrides including succinic anhydride, o-phthalic anhydride, and maleic anhydride. (Succinic anhydride-, o-phthalic anhydride-, and maleic anhydride-based cyclic carbonates were named SSC, PSC, and MSC, respectively.) The structures of SC, SSC, PSC, and MSC were characterized by 1H NMR and FTIR. Then, the novel sorbitol-based aqueous cyclic carbonate dispersion was prepared. It was found that SSC dispersion possessed excellent stability and its particle sizes ranged from 63 to 174 nm with −73.3 to −48.2 mV for the zeta potentials. A series of novel waterborne nonisocyanate polyurethanes coatings (WNIPU) were successfully prepared by sorbitol-based cyclic carbonate reacted with diamines. The effects of diamine categories and the molar ratios of isophorone diamine (IPDA) and hexamethylene diamine (HMDA) on the properties of WNIPU were studied. The results showed that the pencil and pendulum hardness of WNIPU coatings were all relatively decreased with the increase in HMDA contents. The WNIPU coatings exhibited excellent flexibility, adhesion, gloss, and impact resistance with the molar ratios of IPDA/HMDA ranging from 1:1 to 1:3. Moreover, cured films display good thermal stabilities with only 5% weight loss (T5%) in temperatures ranging from 246 to 272°C. Note de contenu : - EXPERIMENTAL : Materials - Preparation of sorbitol-based cyclic carbonate (SC) - Preparation of succinic anhydride (SA)-, maleic anhydride (MAH)-, o-phthalic anhydride (PA)- based aqueous cyclic carbonate dispersions - Preparation of WNIPU coatings - Characterization of SC and WNIPU coatings - RESULTS AND DISCUSSION : Synthesis and characterization of SC - Preparation and characterization of succinic anhydride (SA)-, maleic anhydride (MAH)-, o-phthalic anhydride (PA)-based aqueous cyclic carbonate dispersions - Synthesis and characterization of WNIPU coatings - Properties of WNIPU coatings DOI : 10.1007/s11998-018-00150-8 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0150-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32585 [article]

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Synthesis and properties of fluorinated non-isocyanate polyurethanes coatings with good hydrophobic and oleophobic properties / Zhijun Wu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 5 (09/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 5 (09/2019) . - p. 1233-1241 Titre : Synthesis and properties of fluorinated non-isocyanate polyurethanes coatings with good hydrophobic and oleophobic properties Type de document : texte imprimé Auteurs : Zhijun Wu, Auteur ; Liuyan Tang, Auteur ; Jingtao Dai, Auteur ; Jinqing Qu, Auteur Année de publication : 2019 Article en page(s) : p. 1233-1241 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Caractérisation Carbonate cyclique Fluoropolymères Hydrophobie Oléophobie Polymères -- Synthèse Revêtements organiques Revêtements sans isocyanates Index. décimale : 667.9 Revêtements et enduits Résumé : To improve the chemical resistance of non-isocyanate polyurethane (NIPU), two kinds of diglycidyl ether, bisphenol AF (E-AF) and perfluorooctyl glycidyl ether (PFGE), were selected to synthesize two different cyclic carbonates, bisphenol AF (EC-AF) and perfluorooctyl cyclic carbonate (PFGC), respectively. These cyclic carbonates were successfully used to prepare fluorine-containing non-isocyanate polyurethane coatings. The effects of PFGC amounts on the properties of NIPU were studied, and it was found that the contact angles of water, diiodomethane, and hexadecane were increased with the addition of PFGC and up to 106.7°, 80.2°, and 72.7°, respectively, whereas the pendulum hardness of NIPU coatings relatively decreased with the increase in PFGC contents. The NIPU coatings exhibited excellent flexibility, adhesion, and impact resistance. They also displayed good thermal stability with 5% weight loss temperature (T5%) ranging from 249 to 271°C. Moreover, these coatings possessed very low water uptake, excellent hydrophobic/oleophobic properties, and corrosion resistance properties. Note de contenu : - EXPERIMENTAL : Materials - Preparation of EC-AF and PFGC - Preparation of NIPU coatings - Characterization - RESULTS AND DISCUSSION : Synthesis and characterization of EC-AF and PFGC - Synthesis and characterization of NIPU coatings DOI : 10.1007/s11998-019-00195-5 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00195-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33007 [article]

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Synthesis and properties of water-dispersible polyisocyanates carrying sulfonate / Zhongkang Peng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 17, N° 2 (03/2020)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 17, N° 2 (03/2020) . - p. 345-359 Titre : Synthesis and properties of water-dispersible polyisocyanates carrying sulfonate Type de document : texte imprimé Auteurs : Zhongkang Peng, Auteur ; Liuyan Tang, Auteur ; Ye Yuan, Auteur ; Jinqing Qu, Auteur Année de publication : 2020 Article en page(s) : p. 345-359 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation Dispersions et suspensions Hydrophilie Poids moléculaires Polyisocyanates Polymères -- Synthèse Polymères en émulsion Polyuréthanes Résistance à l'humidité:Résistance à l'eau Revêtements bi-composant Revêtements en phase aqueuse Revêtements organiques Stabilité au stockage Sulfonates Transparence (optique) Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : A series of N-alkylated aminosulfonic acids (NASAs) were synthesized with 1,4-butane sultone and primary amines and then reacted with hexamethylene diisocyanate trimer to obtain water-dispersible polyisocyanates (WDPs). Two-component waterborne polyurethane (2K-WPU) coatings were finally prepared by the reaction of WDPs and aqueous hydroxyl resins. The structures and properties of WDPs and 2K-WPU coatings were characterized. The effects of the categories and amounts of NASAs on the properties of WDPs and 2K-WPU coatings, including viscosities, water resistance and transparency, were investigated. The results showed that the average molecular weights and viscosities of the WDPs increased with the increase in the amounts and molecular weights of NASAs. 3-(Cyclohexylamino)-1-propanesulfonic acid possesses a high molecular weight, resulting in low-concentration –SO3 per mass, so a high concentration up to 3.5 wt% was needed to meet water-dispersible requirements. On the other hand, 3-isobutylamino-1-propanesulfonic acid (IBAPS) has high-concentration –SO3 per mass and only a low concentration (2.5 wt%) was required to offer satisfactory water dispersibility. 2K-WPU film cured by IBAPS-WDP displayed high gloss, good transparency and excellent water resistance owing to suitable steric hindrance and high content of –SO3H per mass. Note de contenu : - EXPERIMENTAL : Materials - The synthesis of NASAs - The synthesis of WDPs - Preparations of 2K-WPU films - Characterization - RESULTS AND DISCUSSION : Synthesis and structures of NASAs and WDPs - Average molecular weight and viscosities of WDPs - Water dispersibility of WDPs - Storage stability of WDPs - Properties of 2K-WPU films - Relationship between substituted group of NASAs and properties of WDPs and 2K-WPU DOI : https://doi.org/10.1007/s11998-019-00277-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-019-00277-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33986 [article]

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Synthesis of UV-curable polyesters with lateral double bonds by ring-opening polymerization and their properties / Yumei Zhou in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 6 (11/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 6 (11/2021) . - p. 1591-1601 Titre : Synthesis of UV-curable polyesters with lateral double bonds by ring-opening polymerization and their properties Type de document : texte imprimé Auteurs : Yumei Zhou, Auteur ; Shujie Ming, Auteur ; Liuyan Tang, Auteur ; Jinqing Qu, Auteur Année de publication : 2021 Article en page(s) : p. 1591-1601 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anhydrides Caractérisation Catalyseurs Copolymère vinyle ester Copolymérisation Epoxydes Monomères Oligomères Photoréticulation Polyesters Revêtements -- Séchage sous rayonnement ultraviolet Revêtements organiques Stabilité thermique Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : UV-curable coatings have been receiving more and more attention for their high performance and environmentally friendly advantages, which meet the “5 E” requirements of coating development. Vinyl oligomer is the main factor affecting the performance of UV-curable coating, but it is difficult to meet the requirements of high-end UV curing technology due to its high viscosity, low vinyl functionality, and high cost. Herein, polyesters with lateral double bonds were prepared by ring-opening polymerization of acid anhydride and glycidyl methacrylate. The epoxy compound without vinyl groups was used to participate in the polymerization reaction to adjust the viscosity and vinyl functionality of the resin. Furthermore, the molecular structure and molecular weight of the polyesters were characterized by FTIR, 1H NMR, and GPC. The effects of the categories and proportions of acid anhydride and glycidyl ether on the viscosity and hardness of the coating films were studied. The results indicated that the use of acid anhydrides containing phenyl rigid groups could significantly increase the hardness of the paint film, and the long-chain tertiary glycidyl carbonate (E10P) had the best viscosity reduction effect. When the molar ratio of acid anhydride, GMA and E10P was 4:1:3, the viscosity of the prepared vinyl polyester was low to 2755 mPa·s. In this case, the hardness of the paint film was as high as H, and it also exhibited excellent water resistance and alcohol resistance. Note de contenu : - EXPERIMENTAL : Materials - Preparation of UV-curable polyesters with lateral double bonds - Characterization - RESULTS AND DISCUSSION : Influencing factors of polyester performances - Structural characterization of the polyesters - Analysis of photocuring behavior of the polyesters - Thermal stability of the polyesters - Film properties of the polyesters - Table 1 : Effect of glycidyl methacrylate content on the properties of the polyesters - Table 2 : Effect of anhydride type on the properties of the polyesters - Table 3 : Effect of different epoxy monomers on the properties of the polyesters - Table 4 : Copolymerization of PA and epoxides - Table 5 : Selection of different ring-opening catalysts - Table 6 : GPC results of the polyesters - Table 7 : The film properties of the polyester DOI : https://doi.org/10.1007/s11998-021-00513-w En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00513-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36818 [article]

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